ULTRA PURE 125KHz SINE WAVE SIGNAL SOURCE
For some RFID systems operating at 125KHz, a very low
distortion signal source reference is needed. The circuit
shown on this page produces a 10-volt peak-to-peak signal
into a 50-ohm load, with a distortion of only 0.01%.
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24db / Octave Linkwitz Riley : The type of filter
(Butterworth, Linkwitz-Riley ect.) indicates the shape and
roll off of the filter. The more common Butterworth has its
cut off frequency at the -3db point. This point is .7071 the
amplitude of the pass band. The Linkwitz-Riley has its cut
off frequency at the -6db point. |
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29.85 MHZ Bandpass Filter Schematic:
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Active 2nd Order Filters: |
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Active Bandpass Filters: |
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Bandpass Filter (Single OpAmp) : A band pass filter
passes a range of frequencies while rejecting frequencies
outside the upper and lower limits of the passband. The
range of frequencies to be passed is called the passband and
extends from a point below the center frequency to a point
above the center frequency where the output voltage falls
about 70% of the output voltage at the center frequency.
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Bandpass Filters: |
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Bandpass Filters: |
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Basic Introduction to Filters : Application notes on
active, passive and switched capacitor filters, document in
PDF format |
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Biquad Active Bandpass Filter Schematic:
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Chebyshe Volt / Butterworth Filters:
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Chebyshe Volt Bandpass Filter: |
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DPPs program key parameters of bandpass filter: EDN -
Design Ideas / The three-amplifier implementation of the
state-variable filter in Figure 1 provides for second-order
bandpass, highpass, and lowpass responses. The strength of
the circuit, however, is in the bandpass response (VOUT/VIN),
in which it's easy to achieve high gain (G) and high Q.
These two characteristics are important in applications in
which selectivity is a key parameter in the filter.. |
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HighQ Bandpass Filter Is Well Suited To CurrentMode Signal
Processing : Electronic Design - Ideas for Design /
Analog signal processing has conventionally been viewed as a
voltage-dominated form of design. But voltage-mode
processing can restrict the system's dynamic range. There is
also a limitation on the input range of signals for linear
operation. An... |
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Inversal Notch and Bandpass Filter: |
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L Band PHEMT LNfor GPS, Inmarsat Etc:
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Multiple Feedback Bandpass Filter: |
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Multiple Feedback Bandpass Filter: |
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Narrow Band Audio Bandpass Filter: |
